Marine tourism development in the Weh Island, Aceh Province needs several supports to enhance the amount of tourism visits such as groundwater availability. Groundwater quality evaluation in the unconfined aquifer systems is essential to assess the ground water advisability. One of the evaluation methods to observe the quality and characteristics of groundwater is physical and chemical parameters measurements completed by geological conditions and groundwater hydrogeochemical characteristics. Ground water facies is divided into five types including CaHCO3, CaCl, NaCl, NaHCO3, and the solution of CaMgCl. Rock weathering is the main factor to determine facies type of groundwater in Weh Island. As much as 54.55% of ground water samples are influenced by the seawater according to Na/Cl ratio. Based on the distance from coastline to Na and Cl elements, it shows a correlation by which the closer toward coastal, the higher salinity level of groundwater. Nevertheless, the entire samples occupy the requirement for daily consumption and utilization according to standardization by WHO, 1993 and Ministry of Health No: 492/MENKES/PER/IV/2010. Therefore, the fresh water provision that is feasible to support marine tourism development in Weh Island can be provided, despite the interpretation result of groundwater chemical data, seawater influence on groundwater takes place.
Marine tourism sector in the Northeast Bali, Indonesia, experienced rapid development in the last decades. However, severe coastal erosion in some parts of the area has threaten the industry. Unsuccessful mitigation measures have been carried out by authorities by constructing seawalls along the coastline. The objective of the study is to understand the physical processes related to coastal erosion in the area and to assess the effectiveness of seawall along the coastline. To achieve the objectives, a GIS approach was carried out to investigate general changes of the coastline since 1944 until 2013. Hydrodynamics analyses and sediment transport simulations were also conducted and validated by the data from field measurements. The role of Mount Agung (a volcanic mountain) to the coastal dynamic system was also investigated. Moreover, the data from cGPS measurements in the island were also used for the analysis of possible land subsidence in the area. From social aspects, the history of USAT Liberty Shipwreck in Tulamben Village supports the analyses and provides information on the evolution of coastline in the area. We conclude that coastal erosion in North-east Bali has long been occurred and strongly affected by the dynamics of hydro-oceanography, volcanic activities, geological dynamics, and human interferences. Finally, the mechanism of coastal erosion in the area was also proposed.
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